I don’t swatch but rather use the yarn I have and the hook to create the right fabric. Swatching would make me try to use a smaller hook, for instance, to get gauge and end up having too stiff a fabric so I just go with what I have. I followed the toddler size but increased for a few extra rows. Modifications are on Ravelry.

When I showed her the hat, I showed her how I made it from string by whipping up a simple beanie for her doll as well.